GPIO 27 -> DHT
GPIO 34 (ADC1_6) -> MQ-a
GPIO 16 -> GPS TX
GPIO 17 -> GPS RX
GPIO 5 -> MMC CS
GPIO 18 -> MMC SCK
GPIO 19 -> MMC MOSI
GPIO 23 -> MMC MISO
GPIO 21 -> CLOCK SDA 
GPIO 22 -> CLOCK SCL

Obs.: MMC_VCC -> 5V
